Means for controlling fluid-operated reciprocating machinery



Nov. 10, 1925. 1,560,705

w. F. MAYER MEANS FOR CONTROLLING FLUID OPERATED RECI PROCATING MACHINERY Filed June 27. 1919 M Q up!!! s N I 1 r K1 EQD M l I \k Lq/ i I O K z w Q1 O \Q/ Q Y 5?, A E Rt ix? m m m 3.2 N 3'. :i, k Q a w v o -INVENT0R.

N By, 1

ATTORNEY.

Patented Nov. 10, 1925.

" UNITED STATES "PATENT OFFICE.

WALDEMAR I. MAYER, OF PHILADELPHIA, PENNSYLVANIA. ASSIGNOR T0 TAYLOR- WHARTON IRQN AND STEEL COMPANY, OF HIGH BRIDGE, NEW J ERSEY, A COR- PORATION OF NEW JERSEY.

MEANS FOR CONTROLLING FLUID-OFERATED REGIPROGATING MACHINERY.

Application hiea June 27, 1919. Serial No. 307,163.

T 0 all whom it may concern:

Be it known that I, WALDEMAR F. MAYER, a citizen ofSwitzerland, residing. at Philadelphia, in the county of Philadelphia and 'State of Pennsylvania, have invented certain new and useful Improvements in Means for Controlling Fluid-Operated Re: ciprocating Machinery, of which the following is a specification.

Objects of the invention are to provide for variations in speed, change of direction, and rest to a driven device from a continuously running fluid gear; to provide for operating machineryof the reciprocating type, such as drawbenches, presses, riveting machines, stamping machines, shears, and the like, requiring different volumes of working fluid to effect the forward and reverse movements ofthe ram or;plunger element; to provide for operating'machines of the nature indicated through the agency of reversible variable fluid delivery pumps; to

provide for operating standard d'rawbenches and the like in the manner lndicated without resorting to alterations in the driven,

- device; and to providefor controlling the ing variations in fluid volume without bypassing the fluid. v v

Vith such and other objects in view, the nature, characteristic features and scope of the invention will more readil be understoodv from the following description taken in connection with the accompanying drawings forming a part hereof, wherein Figure 1 is a plan view partly in section showing my invention applied to a drawno-delivery position.

Fig. 2 is a similar view principally of the control system, showing the parts in operatosition.

I ave chosen to illustrate my invention applied to a drawbench, and. referring to the drawings, 1 designates the tube to be drawn, and 2 the ram which-forces the tube through a die 3. The ram is operated by a piston 4. which is accommodated in a cylinder 5,. Piston rod 6 and ram 2 are provided as usual with a crosshead 7, which travels in suitable ways 8. High pressure workin fluid is admitted to the cylinder throng a port 9 to effect the forward stroke of thepiston and its plunger element or ram, and

the low pressure fluid in the other end of the cylinder is discharged through a port 10. In order to return the plunger and strip the tube, the conditions are reversed, high pressure working fluid being supplied to the cylinder through port 10, and the low pressure working fluid being discharged through port 9.

.The working fluid' pressure is generated by a variable delivery and reversible flow pump 11 such as indicated in Patent No. 1,098,280 having fluid connections 12, 13, and 14, 15, leading, respectively, to ports 9 and 10. The pump 11 is driven continuously in one direction by any suitable prime mover,

careof excessive loa'd requirements and at the start of the stripping action.

The delivery of the pump is controlled by a lever 18, which may be operated in any approved manner, manually or otherwise, a

rod 22, which is adapted and arranged to be shifted by a cam plate 23'pivotally mounted in a bracket 24.

A tank or reservoir 25 is disposed between the two fluid lines and has ports 26 and 27 for example an electric motor 16. Thefly 4 wheel 17, when present, is useful in taking and fluid-ways 28 and 29, which are com trolled by the valves 20 and 21.

At no-delivery position both valves are.

open and the reservoir or tank 25 is in communication with both ends of the cylinder. Thetank is at a higher level than the pump and is partly filled with the working fluid, preferably oil, and tends to keep the pump and cylinder filled to their capacity.

The forward or working stroke of the ram is accomplished by shifting the control lever 18 to the right, as shown in Fig. 2. The effect of this is to rock the cam plate 23 and consequently shift the valve-stem Q2, and cause valve 21 to bear against its seat and thus close the port 26, so that high pressure working fluid is forced by the pump through the connections 12 and 13 t'o-the cylinder. .The low pressure fluid at'the other end of the cylinder is caused to return to the pump, and, valve being open, any deficit is supplied by the storoge tank 9. ,Obviously during its retrogadej move ment the piston ejects more fluid than the cylinder receives and this excess is absorbed V by the tank 25.

Having described the nature and'objects j of the invention, I claim 1. The combination with a member to be driven, including a piston and its cylinder, of a variable and reversible flow fluid delivery pump, fluid connections between the pump and both ends off'the cylinder, and means including a reservoir having valved communications for controlling the variatitns in fluid volume on the low pressure si e.

2. The combination with a member to be driven, including a piston and its cylinder, of a variable and reversible flow fluiddelivery pump, fiuidconnections' between the pump and both endsot'the cylinder alternately operating to supply high pressure and discharge low pressure, and means for controlling the variations 1n fluid volume on the low pressure side, said means being manually controlled to be necessarily open to the low pressure side of such connections when-closed against the high pressure side.

3. The combination with a member to be driven, including a piston and its cylinder,

of a pressure element for delivering a fluid under pressure to said cylinder, connections between said pressure element and cylinder including a storage device, and simultaneously. operating manually governed valves for nections and the storage devlce. 1

ft. The combination with a member to bd driven, including a p ston and its cyhndeiy controlling communication between said coii -f '5. The combination with a member to be driven, including a piston and its cylinder, of a variable and reversible flow fluid delivery pump, fluid connections between the pump and cylinder, a fluid containing chamber having communication with said connections, valves for controlling communication between said chamber and said connections, and means for operating the valves to open the chamber to the pump circulation or to close it against pump flow in one direction.

'6. In combination with a member to be driven, including a piston andits cylinder,

of. a variable and reversible flow fluid delivery pump, connections between the pump andcylinder, a fluid containing chamber on a higher level than the pump and communieating with said connections,'and a valvecontrolling the communication of said cham ber with each connection, said valves being simultaneously operable to open'the chamber to both connections or'to close it against either at will. 1

7 In combinationwith a member to be driven, including a piston and its cylinder, of a variable and reversible flow fluid delivery pump, connections between the'pump and cylinder, 3, fluid containing chamber on a higher level than the pump and commu'nicatinjg with said connections,-avalve controlling the communication of said chamber with eachponnection, and means, operated'in the control of the pump to simultaneously adjust said valves to selectively open the chamber to both connections or close it against either v 1 In testimony whereof aflix my signature. I

. ALDEMAR r. MAYER. 

